From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Jean Louis Newsgroups: gmane.emacs.help Subject: Re: Noob dumb question (extending emacs) Date: Sat, 23 Oct 2021 00:31:24 +0300 Message-ID: References: <86k0i6uoxd.fsf@duenenhof-wilhelm.de> <871r4ernmt.fsf@zoho.eu> <87o87hnrpt.fsf@zoho.eu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="14179"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mutt/2.0.7+183 (3d24855) (2021-05-28) Cc: help-gnu-emacs , Emanuel Berg To: Yuri Khan Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Fri Oct 22 23:36:36 2021 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1me2DL-0003UM-Tc for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 22 Oct 2021 23:36:35 +0200 Original-Received: from localhost ([::1]:39776 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1me2DK-0002lL-QQ for geh-help-gnu-emacs@m.gmane-mx.org; Fri, 22 Oct 2021 17:36:34 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40006) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1me2Ce-0002kV-Cc for help-gnu-emacs@gnu.org; Fri, 22 Oct 2021 17:35:54 -0400 Original-Received: from stw1.rcdrun.com ([217.170.207.13]:48539) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1me2Cc-0000Zn-Li for help-gnu-emacs@gnu.org; Fri, 22 Oct 2021 17:35:52 -0400 Original-Received: from localhost ([::ffff:41.75.191.219]) (AUTH: PLAIN admin, TLS: TLS1.3,256bits,ECDHE_RSA_AES_256_GCM_SHA384) by stw1.rcdrun.com with ESMTPSA id 0000000000065D91.0000000061732EB1.00000144; Fri, 22 Oct 2021 14:35:43 -0700 Mail-Followup-To: Yuri Khan , Emanuel Berg , help-gnu-emacs Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=217.170.207.13; envelope-from=bugs@gnu.support; helo=stw1.rcdrun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.io gmane.emacs.help:134030 Archived-At: * Yuri Khan [2021-10-22 21:56]: > (Sorry for the previous unfinished email.) > > On Sat, 23 Oct 2021 at 00:55, Jean Louis wrote: > > > For people interested, manual explains about randomity: > > (info "(elisp) Random Numbers") > > > > How I understand it, than it may be that neither `pwgen' is generating > > truly random numbers. > > Inspecting the source shows pwgen uses /dev/urandom if available, and > /dev/random otherwise, and all bytes of the password come from one of > those sources. These are as random as you can get and use thermal > noise in your HDD as one of the sources of randomness. Which tells me Emacs Lisp could have access to such data and set the seed quite randomly practically: - I have noticed that file "/proc/pressure/io" is constantly changing, could not find temperature stuff now, thus: (defun first-line-of-file (file) (with-temp-buffer (insert-file-contents file) (substring (buffer-string) 0 (string-match "\n" (buffer-string))))) (let ((line (first-line-of-file "/proc/pressure/io"))) ;; Now set random seed: (random line) ;; Now generate random password (rcd-password)) ⇒ "TMqVMJiT(JKR1^8uLYzT" You say that passwords are not really random and Emacs Lisp is not made for that. I say that passwords can be generated practically to be random for the user from the users' viewpoint, and it is evident. If you can predict the password I am generating it will become evident that passwords are not truly random. Until then... they are random. ;-) -- Jean Take action in Free Software Foundation campaigns: https://www.fsf.org/campaigns In support of Richard M. Stallman https://stallmansupport.org/